title: Assessment of methane emission and oxidation at Air Hitam  Landfill site cover soil in wet tropical climate.
abstract: Methane (CH₄) emissions and oxidation were measured at the Air Hitam sanitary landfill in Malaysia and were modeled using the Intergovernmental Panel on Climate Change waste model to estimate the CH₄ generation rate constant, k. The emissions were measured at several locations using a fabricated static flux chamber. A combination of gas concentrations in soil profiles and surface CH₄ and carbon dioxide (CO₂) emissions at four monitoring locations were used to estimate the CH₄ oxidation capacity. The temporal variations in CH₄ and CO₂ emissions were also investigated in this study. Geospatial means using point kriging and inverse distance weight (IDW), as well as arithmetic and geometric means, were used to estimate total CH₄ emissions. The point kriging, IDW, and arithmetic means were almost identical and were two times higher than the geometric mean. The CH₄ emission geospatial means estimated using the kriging and IDW methods were 30.81 and 30.49 gm(−2) day(−1), respectively. The total CH₄ emissions from the studied area were 53.8 kg day(−1). The mean of the CH₄ oxidation capacity was 27.5 %. The estimated value of k is 0.138 year(−1). Special consideration must be given to the CH₄ oxidation in the wet tropical climate for enhancing CH₄ emission reduction.
authors.forename: Mohammed F M
authors.initials: MF
authors.lastname: Abushammala
authors.forename: Noor Ezlin Ahmad
authors.initials: NE
authors.lastname: Basri
authors.forename: Rahmah
authors.initials: R
authors.lastname: Elfithri
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D004784:Environmental Monitoring; D008296:Malaysia; D008697:Methane / Q000032:analysis*; D010084:Oxidation-Reduction; D012987:Soil / Q000737:chemistry*; D014329:Tropical Climate; D064091:Waste Disposal Facilities
chemical_list: D000393:Air Pollutants; D012987:Soil; D008697:Methane